Faxon 9310 6.8 SPC / .224 Valkyrie AR-15 bolt (.125) featuring MPI inspection, MIL-SPEC heat treatment and shot peening. Chamfered lugs for reliability. S7 tool steel extractor with Crane O-ring. Salt bath nitride finish for hardness and corrosion resistance. Bolt face is .125 and designed for AR-15 barrels chambered in 6.8 SPC and .224 Valkyrie that use the .125 bolt specification. MPI tested for material integrity.